Nordic Electricity Market Analysis: March 31, 2026

Drafted by Gemini 2.5 Flash and reviewed by Claude Sonnet 4. Sourced from NordPool, SMHI, SvD Näringsliv, DN Ekonomi, SVT Ekonomi, and Second Opinion. Please note: This information is AI-generated and provided as-is without warranty. Readers should independently verify all data before making decisions.

Executive Summary

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The Swedish electricity market in bidding area SE3 experienced a significant price surge on Tuesday, 2026-03-31, with the day-ahead average spot price reaching 1068.91 SEK/MWh. This marks a dramatic escalation from the previous day’s 390.94 SEK/MWh and the 7-day average of 362.2 SEK/MWh, continuing a trend of increasing market stress observed since March 25. Geopolitical tensions, particularly the ongoing “Irankriget” and its impact on the Hormuz Strait, remain the dominant factor driving market uncertainty and elevated energy prices across Europe. Multiple planned transmission outages affecting SE3, coupled with numerous unplanned generation outages across the Nordic region, compounded the supply constraints. Ancillary service markets, especially mFRR EAM, exhibited high volatility and robust pricing, reflecting the critical need for system stability amidst these challenging conditions.

Day-Ahead Spot Prices

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Commentary The day-ahead spot prices in SE3 for March 31, 2026, demonstrated a sharp upward trend, continuing an escalation pattern observed over the past week. The average price of 1068.91 SEK/MWh is a substantial increase from the previous day’s average of 390.94 SEK/MWh and significantly higher than the 7-day average of 362.2 SEK/MWh. This marks a dramatic price escalation from March 25 (160.4 SEK/MWh) to March 27 (605.6 SEK/MWh), culminating in today’s high. Prices peaked at 1791.89 SEK/MWh (164.24 EUR/MWh) at 19:00 CET, indicating high demand during evening hours. The minimum price was 583.59 SEK/MWh (53.49 EUR/MWh) at 14:00 CET, still considerably higher than the previous day’s minimum of 34.9 SEK/MWh. The peak average price (1176.03 SEK/MWh or 107.78 EUR/MWh) was notably higher than the off-peak average (854.68 SEK/MWh or 78.35 EUR/MWh), highlighting pronounced intraday price volatility and demand-driven peaks. This substantial price increase reflects a significantly tightened market, influenced by a combination of geopolitical factors, regional supply concerns, and potentially increased demand.

Price Spread Across Bidding Areas

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Commentary A clear and significant north-to-south price gradient was observed across the Swedish bidding areas on March 31. SE1 and SE2 maintained considerably lower average prices at 705.31 SEK/MWh and 780.59 SEK/MWh, respectively. SE3’s average price of 1068.91 SEK/MWh was substantially higher than the northern areas, while SE4 recorded the highest average at 1216.26 SEK/MWh. This substantial price spread, particularly between SE1/SE2 and SE3/SE4, indicates significant transmission constraints limiting power flow from the more generation-rich northern regions to the demand centers in the south. The maximum price in SE4 reached 2255.46 SEK/MWh, highlighting severe localized scarcity during peak hours. Multiple planned transmission maintenance events by Svenska kraftnät, specifically affecting SE2 → SE3, SE3 → SE4, and FI → SE3, as reported in UMMs, directly exacerbated these price differences by reducing import capabilities into SE3 and SE4. The precise MW reduction is not quantified in the UMMs, but the cumulative effect of these planned outages clearly restricted inter-area power transfer.

News & Geopolitical Context

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Geopolitical events continue to cast a long shadow over the European energy markets, significantly influencing prices and market sentiment.

• Irankriget and Hormuzsundet: Multiple news items from SvD_Naringsliv highlight the ongoing “Irankriget” and its direct impact on energy security. President Trump’s statements about ending the war without reopening the Hormuz Strait (“2026-03-31 01:48 CET”) and his earlier assertion that “Enkelt för USA att ta över Khargön” (“2026-03-30 05:16 CET”) create extreme uncertainty. The closure of the Hormuz Strait, a critical chokepoint for global oil shipments, is explicitly linked to an “Energikrisen tilltar – EU-ministrar i akut möte” (“2026-03-31 12:07 CET”). This crisis has spread to Europe, prompting EU Energy Ministers to hold an emergency meeting, potentially advising citizens to reduce travel. Riksbankschefen Erik Thedéen also warned of an “utdraget krig i Mellanöstern” (“2026-03-31 08:17 CET”). The question “Vem vinner på Hormuzkrisen?” (“2026-03-31 09:18 CET”) underscores the economic implications, including the risk of high energy prices impacting the 2026 election. This ongoing conflict and its direct threat to oil supply routes are the primary drivers behind the elevated and volatile electricity prices seen today, as global energy supply concerns translate into higher power market risk premiums.
• International Relations and Military Actions: News regarding US warplanes being denied refueling stops in Italy, Spain, and France (“2026-03-31 10:38 CET”, “2026-03-30 11:34 CET”) indicates a broader geopolitical strain affecting military logistics and potentially international cooperation. Israel’s defense minister’s statement about demolishing houses in Lebanese villages “som i Rafah” (“2026-03-31 07:07 CET”) further escalates regional tensions. An “Amerikanskt flygplan kraftigt skadat i attack” in Saudi Arabia (“2026-03-30 14:24 CET”) highlights the direct military engagement and its consequences. These events contribute to the overall climate of instability, which directly translates into higher risk premiums in energy markets.
• Domestic Energy Policy and Grid Investments:
  • Svenska kraftnät announced “Avvägningar mellan miljökrav och vattenkraft” (“2026-03-31 14:01 CET”), indicating ongoing efforts to balance environmental regulations with the need for efficient hydropower production. This is crucial for Sweden’s energy mix.
  • The agreement with Sydkraft Thermal Power AB for Karlshamnsverket’s reconstruction service, aimed at strengthening “leveranssäkerheten” (“2026-03-31 08:31 CET”), demonstrates proactive measures to enhance grid stability and reliability.
  • Svenska kraftnät’s submission of a concession application for the Naalojärvi–Messaure 400 kV line (“2026-03-30 13:51 CET”) signals future grid expansion, which could alleviate transmission constraints in the long term.
  • The ongoing consultation for “uppdelning av FCR-N” (“2026-03-30 10:01 CET”) could lead to changes in the frequency regulation market, potentially impacting BESS operators.
• Other Market Information: Ingrid Capacity AB has an “Other market information” event active for SE3 and SE4 until 2026-04-02 00:00 CET (“2026-03-31 17:35 CET”, “2026-03-30 16:33 CET”), which could be related to BESS operations or other local market adjustments.

The overarching theme remains the severe impact of the Middle East conflict on global energy supply, directly translating into higher and more volatile electricity prices in the Nordic market. Domestic efforts to bolster grid stability and expand transmission capacity are positive but cannot fully mitigate the immediate effects of international geopolitical crises.

Ancillary Services

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FCR-N

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The average FCR-N price for the day was 17.46 EUR/MW, with a minimum of 14.87 EUR/MW and a maximum of 28.57 EUR/MW. This is a slight decrease from the previous day’s average of 15.9 EUR/MW (2026-03-30), but broadly in line with the 7-day historical range, which saw averages between 14.9 EUR/MW and 21.2 EUR/MW. The relatively high maximum price indicates periods of increased demand for frequency containment normal reserves, likely during hours of higher system stress.

FCR-D

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FCR-D Up averaged 4.68 EUR/MW, with a minimum of 2.25 EUR/MW and a maximum of 13.18 EUR/MW. FCR-D Down averaged 1.25 EUR/MW, with a minimum of 1.1 EUR/MW and a maximum of 1.38 EUR/MW. Compared to the previous day (2026-03-30), FCR-D Up has decreased from 9.2 EUR/MW, while FCR-D Down has slightly decreased from 1.5 EUR/MW. The 7-day history shows FCR-D Up averages ranging from 1.8 EUR/MW to 9.2 EUR/MW, and FCR-D Down from 1.3 EUR/MW to 9.9 EUR/MW. The current FCR-D Up prices, while lower than yesterday, still offer opportunities, especially given the higher maximums. The FCR-D Down market remains relatively stable and low-priced.

mFRR CM

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The mFRR Capacity Market (CM) saw an average Up price of 9.37 EUR/MW, ranging from 2.5 EUR/MW to 53.69 EUR/MW. The Down average was 1.77 EUR/MW, with a range of 0.1 EUR/MW to 5.0 EUR/MW. These values are higher than the previous day’s mFRR CM averages. The wide range in Up prices suggests periods of high demand for upward regulation, indicating potential system imbalances or unexpected generation shortfalls.

mFRR EAM

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The mFRR Energy Activation Market (EAM) showed an average imbalance price of 89.09 EUR/MWh, with a minimum of 0.2 EUR/MWh and a maximum of 240.9 EUR/MWh. A total of 1583.0 MW was activated for upward regulation and 815.0 MW for downward regulation. The market experienced 12 hours of upward regulation and 12 hours of downward regulation. The average spread against day-ahead prices was -3.94 EUR, with a maximum upward spread of 43.19 EUR and a maximum downward spread of -76.48 EUR.

Commentary The mFRR EAM hourly profile reveals significant price dynamics. During the early morning hours (00:00-06:00 CET), the market was predominantly in downward regulation, with large negative spreads against day-ahead prices, reaching -53.98 EUR at 03:00 CET. This indicates an oversupply of power relative to the day-ahead forecast. From 07:00 CET to 15:00 CET, the market shifted to consistent upward regulation, with positive spreads peaking at 43.19 EUR at 14:00 CET. This period likely corresponds to increasing demand and potential under-forecasting of generation. The evening hours (16:00-18:00 CET and 22:00-23:00 CET) saw a return to downward regulation with substantial negative spreads, particularly at 23:00 CET (-76.48 EUR). The late evening (19:00-21:00 CET) again showed upward regulation with positive spreads.

Compared to the 7-day ancillary history, today’s mFRR EAM shows a balanced number of up and down regulation hours (12 each), which contrasts with some previous days that had a clear dominance of one direction (e.g., March 24 with 5 up and 19 down hours, or March 30 with 5 up and 18 down hours). The average imbalance price of 89.09 EUR/MWh is significantly higher than the 7-day average imbalance prices, which ranged from 15.1 EUR/MWh to 115.5 EUR/MWh. This indicates a much more volatile and expensive balancing market today, offering substantial opportunities for flexible assets. The high volatility in mFRR imbalance prices, with a maximum historical average of 115.5 EUR/MWh (March 26) and today’s 89.09 EUR/MWh, underscores the consistent need for responsive balancing services.

Weather Conditions

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Commentary Today’s weather forecasts for SE3 indicate relatively mild and calm conditions. Average temperatures across Göteborg, Linköping, and Stockholm range from 4.6°C to 6.5°C, which is slightly warmer than the 7-day average temperature of 4.9°C from the weather history. Wind speeds are notably low, averaging approximately 2.57 m/s across the cities. This is approximately 37% below the 7-day average wind speed of 4.1 m/s (calculated from weather_history data), indicating significantly reduced wind power generation contribution. Cloud cover is also low, ranging from 2.0% to 4.0%, and precipitation is negligible.

Compared to the past seven days, which saw average temperatures hovering around 4-6°C, today’s temperatures are consistent, suggesting no abnormal heating demand. However, the significantly lower wind speeds directly translate to reduced renewable generation, which, in the context of already tight supply, contributes to higher prices. The low precipitation stands in contrast to several days in the past week, which saw significant rainfall (e.g., 41.9 mm on March 24 and 150.1 mm on March 25), potentially impacting hydropower reserves in the long term, though not immediately apparent today. Therefore, while mild weather reduces heating demand, the diminished wind generation capacity, coupled with broader supply constraints, plays a role in the elevated spot prices.

Grid & Market Events

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• Planned Unavailability: Transmission, SE2 → SE3, SE3 → SE4, FI → SE3, SE3 → DK1, SE3 → NO1 (Svenska kraftnät, multiple UMMs on 2026-03-31 and 2026-03-30): Numerous planned maintenance events by Svenska kraftnät are actively reducing transmission capacity into and out of SE3, as well as between SE3 and other Nordic and European areas (DK1, NO1, FI). These planned outages, particularly those affecting SE2→SE3 and SE3→SE4, directly contribute to the observed price differentials and higher prices in SE3 and SE4 by limiting the import of cheaper power from northern Sweden and Finland. While specific MW reductions are not provided in the UMM summaries, the cumulative effect of these multiple transmission constraints clearly restricts power flow across the Swedish bidding zones and interconnections.
• Planned Unavailability: Production, SE3, Värtan - KVV1 (Stockholm Exergi AB, 2026-03-31 12:53 CET, 2026-03-31 12:52 CET): Planned yearly maintenance and turbine maintenance at the Värtan KVV1 power plant in SE3 will reduce local generation capacity. This is a significant local event for SE3, further tightening supply within the bidding area.
• Unplanned Unavailability: Production, NO5, Naddvik - G1 (Østfold Energi AS, 2026-03-31 20:24 CET): An unplanned outage due to a “failure” and “problemer ved oppstart av aggregat” at Naddvik - G1 in NO5 impacts Norwegian production.
• Unplanned Unavailability: Production, DK2, Avedøreværket - AVV2 & Kyndbyværket - KYV22 (Ørsted Bioenergy & Thermal Power A/S, multiple UMMs on 2026-03-31): Multiple unplanned outages at Danish power plants (Avedøreværket and Kyndbyværket) due to “failure” and “issues” reduce generation capacity in DK2.
• Unplanned Unavailability: Production, FI, Martinlaakso - B1 & Consumption, FI, Martinlaakso EB01 (Vantaan Energia Oy, multiple UMMs on 2026-03-31): Unplanned technical problems affecting both production and consumption in Finland.
• Unplanned Unavailability: Production, NO2, Saurdal & Brokke (Statkraft Energi AS / Å ENERGI VANNKRAFT AS, multiple UMMs on 2026-03-31): Several unplanned outages at Norwegian hydropower plants (Saurdal and Brokke) due to “urgent work” and “failure”.
• Planned Unavailability: Production, FI, Loviisa Block 2 (Fortum Power and Heat Oy, multiple UMMs on 2026-03-31): Planned maintenance for turbine warranty tests at Loviisa Block 2 in Finland impacts nuclear generation.
• Unplanned Unavailability: Production, BE, COO 123 - COO 3, FLEMALLE TH1, NL, EEMS 4, ROTTERDAM 1 (Electrabel SA, multiple UMMs on 2026-03-31 and 2026-03-30): Numerous unplanned outages in Belgium and the Netherlands.
• Unplanned Unavailability: Production, IE, Kilroot, Edenderry Power Plant, Dublin Waste to Energy, Whitegate Power Station, Aghada (EP Kilroot Ltd, Bord na Mona Powergen Ltd, Dublin Waste to Energy, Bord Gais Energy Ltd, ESB Trading, multiple UMMs on 2026-03-31 and 2026-03-30): Extensive unplanned outages across Ireland.
• Other Market Information: SE3, SE4 (Ingrid Capacity AB, 2026-03-31 17:35 CET): This ongoing event, active since February, indicates specific market adjustments or operational changes in SE3 and SE4, potentially related to BESS or other flexible resources.
• Svenska kraftnät st\u00e4rker leveranss\u00e4kerheten (SVK_Drift, 2026-03-31 08:31 CET): Agreement with Sydkraft Thermal Power AB for Karlshamnsverket for reconstruction service, enhancing system reliability.
• Avv\u00e4gningar mellan milj\u00f6krav och vattenkraft (SVK_Drift, 2026-03-31 14:01 CET): Svenska kraftnät, Havs- och vattenmyndigheten, and Energimyndigheten are reviewing guidelines for hydropower environmental conditions, which could impact future generation capacity.

Commentary The grid and market events on March 31, 2026, present a challenging picture for the electricity market in SE3. The numerous planned transmission outages by Svenska kraftnät, particularly those impacting flows into and out of SE3, are a direct cause of the high price spreads and elevated spot prices in southern Sweden. The planned maintenance at Värtan KVV1 further exacerbates the local supply situation in SE3.

Beyond Sweden, a significant number of unplanned production outages across Norway (Naddvik, Saurdal, Brokke), Denmark (Avedøreværket, Kyndbyværket), Finland (Martinlaakso, Loviisa Block 2), Belgium, Netherlands, and Ireland indicate a widespread tightening of generation capacity in the broader Nordic and interconnected European markets. While the exact cumulative MW impact of these outages is not specified in the UMMs, the sheer volume and geographical spread of these events clearly point to a substantial reduction in available generation. This regional supply crunch, combined with the transmission constraints within Sweden, creates a perfect storm for high and volatile prices in SE3. The “Other market information” from Ingrid Capacity AB for SE3 and SE4 is worth monitoring for any specific local impacts. Overall, the market is under considerable stress due to a combination of planned grid works and unexpected generation losses across the region.

Implications for BESS in SE3

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The current market conditions in SE3 present significant opportunities for Battery Energy Storage System (BESS) operators.

• Spot Price Arbitrage: The high day-ahead spot price volatility, with a minimum of 583.59 SEK/MWh and a maximum of 1791.89 SEK/MWh, offers substantial opportunities for arbitrage. BESS can strategically charge during off-peak hours (e.g., 13:00-14:00 CET with prices around 583-599 SEK/MWh) and discharge during peak hours (e.g., 18:00-21:00 CET with prices well over 1500 SEK/MWh, peaking at 1791.89 SEK/MWh at 19:00 CET). The pronounced difference between peak (1176.03 SEK/MWh) and off-peak (854.68 SEK/MWh) average prices further supports this strategy.
• mFRR EAM Participation: The mFRR EAM market is highly lucrative. The significant average imbalance price of 89.09 EUR/MWh and the high maximum spreads (up to 43.19 EUR for upward regulation and -76.48 EUR for downward regulation) indicate strong demand for balancing services. BESS are ideally suited to provide both upward and downward regulation. The hourly profile of mFRR EAM, showing distinct periods of upward and downward regulation, allows for strategic bidding. Operators can target periods of high positive spread for upward regulation (e.g., 07:00-15:00 CET) and high negative spread for downward regulation (e.g., 00:00-06:00 CET and 17:00, 22:00-23:00 CET) to maximize revenue. The sustained high volatility in mFRR imbalance prices observed over the past week (ranging from 15.1 EUR/MWh to 115.5 EUR/MWh average daily) reinforces the consistent value of BESS in this market.
• FCR Markets: FCR-N prices, with an average of 17.46 EUR/MW and a maximum of 28.57 EUR/MW, offer a stable revenue stream. While FCR-D Up prices are lower than yesterday, the maximum of 13.18 EUR/MW still presents opportunities, especially given the continuous need for frequency regulation. BESS can participate in both FCR-N and FCR-D to diversify revenue streams and contribute to grid stability. Historical FCR-N averages over the last 7 days (14.9-21.2 EUR/MW) demonstrate consistent demand.
• Transmission Constraints: The significant price spreads between SE3 and the northern bidding areas (SE1, SE2) due to transmission constraints highlight the value of localized flexible resources in SE3. BESS can help alleviate these local bottlenecks by providing power when imports are restricted or expensive.
• Risk Mitigation: Given the geopolitical instability and numerous unplanned outages, the market is prone to sudden price spikes and imbalances. BESS can act as a shock absorber, providing rapid response services and capitalizing on these volatile conditions.

In summary, BESS operators in SE3 have excellent opportunities to generate revenue through spot price arbitrage and participation in the mFRR EAM, which shows high volatility and strong price signals for both up and down regulation. FCR markets also remain attractive for stable revenue generation.

Outlook

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The outlook for the Swedish electricity market, particularly in SE3, remains highly uncertain and prone to extreme volatility. The ongoing geopolitical tensions surrounding the “Irankriget” and the Hormuz Strait are the primary drivers of this instability, with potential for continued high energy prices across Europe. Price ranges are expected to remain elevated, with significant intraday swings driven by supply-demand dynamics and balancing market needs.

Upcoming grid events, such as the continued planned transmission maintenance affecting SE3 (e.g., SE2 → SE3, SE3 → SE4, FI → SE3) and the planned maintenance at Ringhals block 4 (G42) in SE3, will continue to impact local and regional supply. Additionally, an “Other market information” event from Uniper Global Commodities SE affecting SE4 and SE2 is scheduled to start on 2026-04-01 00:00 CET, which could introduce further market adjustments. Weather forecasts for the coming days suggest mild conditions, reducing demand pressure from heating, but low wind speeds may continue to limit renewable generation. BESS operators should remain highly agile, closely monitoring geopolitical developments, grid status, and ancillary service market signals to optimize their strategies and capitalize on the prevailing market volatility.